--- a/vehicle.c	Wed Jan 19 19:15:03 2005 +0000
+++ b/vehicle.c	Wed Jan 19 19:32:33 2005 +0000
@@ -1375,7 +1375,7 @@
 					}
 				} else {
 					if ( u->engine_type == old_engine_type && RailVehInfo(old_engine_type)->flags & RVI_MULTIHEAD) {
-						if (v->next != NULL) rear_engine_cost = -u->value;
+						if (v->next != NULL) rear_engine_cost = -(int32)u->value;
 					}
 				}
 			 }